Pinouts of Connectors

VGA (15) connector pinout

schematic diagram

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Nearly all modern PC graphics cards use the same 15 pin conenctor that the original IBM VGA card used. VGA=Video Graphics Adapter or Video Graphics Array. Videotype: Analogue.

15 pin HIGHDENSITY D-SUB FEMALE connector pin-out & layout
15 pin HIGHDENSITY D-SUB FEMALE connector  at the videocard
Pin Name Dir Description
1 RED --> Red Video (75 ohm, 0.7 V p-p)
2 GREEN --> Green Video (75 ohm, 0.7 V p-p)
3 BLUE --> Blue Video (75 ohm, 0.7 V p-p)
4 ID2 <-- Monitor ID Bit 2
5 GND --- Ground
6 RGND --- Red Ground
7 GGND --- Green Ground
8 BGND --- Blue Ground
9 KEY - Key (No pin)
10 SGND --- Sync Ground
11 ID0 <-- Monitor ID Bit 0
12 ID1 or SDA <-- Monitor ID Bit 1
13 HSYNC or CSYNC --> Horizontal Sync (or Composite Sync)
14 VSYNC --> Vertical Sync
15 ID3 or SCL <-- Monitor ID Bit 3
Note: Direction is Computer relative Monitor. All signals except R, G, B are TTL level signals.

Monitor ID detection pin assignments

4    11   12
ID2  ID0  ID1

n/c  n/c  n/c   no monitor
n/c  n/c  GND   Mono monitor which does not sopport 1024x768
n/c  GND  n/c   Color monitor which does not support 1024x768
GND  GND  n/c   Color monitor which supports 1024x768
GND means connected to ground
n/c means that the pin has not connected anywhere

This monitor type detection is becoming more and more obsolete nowadays. New plug-and-play monitors communicate with the computer according to VESA DDC standard.


VESA Display Data Channel is a method for integrating digital interface to VGA conenctor to be able the monitor and grapahics card to communicate. There are two different levels of DDC: DDC1 and DDC2.


DDC1 allows the monitor to tell it"s parapeters to the computer. The following VGA card connector pins had to be changed to allow DDC1 fuctions:

pin    new function
 9     Optional +5V output from graphics card
12     Data from display
14     Standard vertical sync signal which works also as data clock
15     Monitor ID3
When grpahics card detects data on data-line it starts to read the data coming from the monitor syncronous to vertical sync pulse. Vertical sync pulse frequency can be increased up to 25 KHz for the time of the data transfer if a DDC1 compliant monitor is found (be sure not to send those high frequencies to non DDC1 monitors!).


DDC2 allows bidirectional communication: monitor can tell it"s parameters and computer can adjust monitor settings. The bidirectional data bus is a syncronous data bus similar to Access Bus and is based on I2C technology. Tho following pins had to be changed to to enable DDC2 to work:

pin    new function
 9     Optional +5V output from graphics card
12     Bidirectional data line (SDA)
15     Data clock (SLC)
The signals in the data bus are standard I2C signals. The computer provides 15 kohm pullup for the SDA and SLC lines. Monitor must provide 47 kohm pull-up on SCLK line.

NOTE: If the optional +5V power output pin is used, a special DDC/VGA connector must be used to to provide proper sequencing. The +5V output voltage must be withing +/-5% range and tha card must be able to supply at least 300 mA current (maximum 1A).

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15 pin HIGHDENSITY D-SUB MALE connector pin-outs & layouts
15 pin HIGHDENSITY D-SUB MALE connector  at the monitor cable > Pinouts of video connectors >  Pinout of VGA (15) connector and layout of 15 pin HIGHDENSITY D-SUB FEMALE connector and 15 pin HIGHDENSITY D-SUB MALE connector

Source(s): Hardware Book, Tomi Engdahl
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